The image menu

This menu contains general operations which can be applied to the whole of the image in the current window.

Zoom in magnifies the displayed image (but not the original image) by a factor of 2, which may mean the window only shows a portion of it. Scroll bars enable viewing the off-screen portions. To scale the original image, see the geometry menu.

Zoom out shrinks the image display (but not the original image) by a factor of 2.

Fit to screen scales the image display so the whole image will fit in the screen. This does not change the size of the window framing the image.

Save as asks for a file name and saves the image. This is one way of making a copy of the image.

Clone, in new window is another way of making a copy. This opens a new image window and fills it with the contents of the current one.

Reload this window from file reloads the original image from disc. This is particularly useful when thresholding has been done on a processed image but then we want to use the mask to detect blobs in the original image.

Display in pseudocolour Colours the brightness levels in the image according to a spectrum-like colour scale: black(0) - red - yellow - green - cyan - blue - magenta - white(max). This only affects the display, not the original image. The menu option changes to Display without pseudocolour to go back to the original view. Pseudocolour can sometimes be useful for visualising subtle changes of brightness across regions of an image. It can also have creative uses of course.

Show image information opens a message window to show basic information about the image such as its width, height and bits per channel. If image metadata were found when the image file was opened, such data as are relevant to photography (aperture, exposure time, etc) are also shown. If you want to save the information in an XML file, see the batch menu.

View history of this window displays a list of all the menu options which have been selected to modify the current image/frame since it was created.

Draw colour chart replaces the current image with a graphical image designed for testing print-outs. GRIP does not have image printing facilities itself - save the image and use the appropriate application in your system.

Draw grid replaces the current image by a graphical image designed for testing spherical aberrations in camera lenses. Save this and print it. Photograph it. Open the resulting image in GRIP and use options on the measurement menu to see what the camera optics have done to it.

Draw Mandelbrot curve draws an overall view of the Mandelbrot curve into the current frame. Clicking the mouse at any point in the image recalculates it, zoomed up by a factor of 2 about that point. Zooming can be done repeatedly. That is not the same as zooming from this menu, which zooms the display without changing the image itself.

Add 1-pixel white rim draws white into the outermost rim of pixels in the image. This is intended to help when rotating or projecting the image, to see where the edge ends up. Unlike other image processing applications, GRIP always expands the image in such transformations so that none of the resulting image is cropped off. It makes the unfilled areas black.

Add border adds a coloured border equally on all sides of the image, making it larger. You will be prompted to specify the width of the border, in pixels, and its colour.

Find GRIP window brings the main GRIP window to the front, so it is visible (this does work in Windows but the Java API documentation says this will not necessarily work on all platforms).

Close this window closes this window but does not save anything. It is up to you to have saved the image on disc first, if required.

Help about this menu displays the present page if you have installed files as described here.